Introduced rat assemblage affects feral cat threat to biodiversity in French Polynesian islands
P. Palmas A B C * , J.-Y. Meyer D , E. Chailler A , H. De Méringo C E , E. Vidal F , J.-C. Gaertner G , R. Bambridge H , T. Mooroa H , I. Hurahutia I , G. Teatiu J , S. Teatiu J and T. Timau KA Université de la Polynésie Française, UMR-241 EIO, Tahiti, French Polynesia.
B EcoTer, BP64182, 98702 Faa’a, Tahiti, French Polynesia.
C Institut Méditerranéen de Biodiversité et d’Ecologie Marine et Continentale (IMBE), Aix Marseille Université, CNRS, IRD, Avignon Université, France & Centre IRD de Nouméa, BPA5, 98848 Nouméa cedex, New Caledonia.
D Délégation à la Recherche, Gouvernement de la Polynésie Française, BP 20981, 98713 Papeete, Tahiti, French Polynesia.
E Institut Méditerranéen de Biodiversité et d’Écologie Marine et Continentale (IMBE), Aix Marseille Université, CNRS, IRD, Avignon Université, Europôle de l’Arbois, BP 80, 13545, Aix-en-Provence, France.
F UMR ENTROPIE, (IRD, Université de La Réunion, CNRS, Université de La Nouvelle-Calédonie, Ifremer), Centre IRD, BP A5, 98848 Nouméa, New Caledonia.
G IRD, UMR-241 EIO, Labex Corail, Tahiti, French Polynesia.
H Association Rima’ura, 98752 Amaru, Rimatara, French Polynesia.
I Association Te Aru Ora, 98753 Moerai, Rurutu, French Polynesia.
J Mairie de Ua Huka, 98756 Vaipaee, Ua Huka, French Polynesia.
K Association TE IMA HA’ATUPUA’E O UAVAI, 98746 Vaitahu, Tahuata, French Polynesia.
Abstract
Invasive feral cats strongly threaten native fauna on islands worldwide. The impact of feral cat populations is assumed to be higher in the presence of introduced rodents and may also vary according to an island’s rodent species assemblage.
This study assessed feral cat impacts on island biodiversity in French Polynesian islands harbouring differing assemblages of rat species, by investigating their abundance and trophic ecology.
We focused on the following six human-inhabited islands of three archipelagos in French Polynesia (South Pacific) with differing rat species assemblages: Tahiti and Moorea, Ua Huka and Tahuata, Rurutu and Rimatara. We studied (1) cat abundance, by setting up camera traps during 15 consecutive days to provide an abundance index, the general index (GI) or mean number of virtual captures per camera per occasion, and (2) cat diet, by performing macroscopic analyses of scat samples to determine the frequency of occurrence (FO) of prey categories.
Our study showed previously unreported patterns of cat-abundance index for the Society archipelago, with a GI of 0.30 ± 0.12 in Tahiti and 0.02 ± 0.02 in Moorea; for the Marquesas, with a GI of 0.75 ± 0.20 in Ua Huka and 0.20 ± 0.06 in Tahuata; and for the Austral, with a GI of 0.06 ± 0.04 in Rurutu and 0.19 ± 0.05 in Rimatara. Feral cats are shown to prey strongly on introduced rodents (FO = 91.3%), arthropods (37.8%), squamates (18.6%) and birds (13.3%) in our study sites. FO of birds are particularly high in Rimatara (31.9%) and Ua Huka (16.8%).
We demonstrated that feral cats represent a serious threat to biodiversity in French Polynesian islands, with 15 species preyed on, including eight endemic birds, four of them being considered threatened by the IUCN Red List. Surprisingly, relative abundances of feral cats were higher both on islands harbouring only one rat species (Ua Huka, with only Rattus exulans) and on islands free of black rats. This finding raises questions regarding the ‘hyperpredation’ hypothesis for multi-invaded island ecosystems.
This study on islands with differing assemblages of introduced rodents demonstrated the need for invasive predator studies in multi-invaded ecosystems, so as to improve bird conservation and guide management strategies and site prioritisation.
Keywords: camera-trap monitoring, diet, endemic bird species, Felis catus, invasive predator, multi-invaded ecosystems, Pacific island conservation, Rattus spp.
References
Bengsen AJ, Butler JA, Masters P (2012) Applying home-range and landscape-use data to design effective feral-cat control programs. Wildlife Research 39(3), 258-265.
| Crossref | Google Scholar |
BirdLife International (2016) Vini kuhlii. The IUCN Red List of Threatened Species 2016: e.T22684630A93038207. Available at https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22684630A93038207.en [Accessed 28 May 2022]
BirdLife International (2017) Pomarea iphis. The IUCN Red List of Threatened Species 2017: e.T22734314A119194254. Available at https://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T22734314A119194254.en [Accessed 28 May 2022]
BirdLife International (2018) Vini ultramarina. The IUCN Red List of Threatened Species 2018: e.T22684647A132055913. Available at https://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T22684647A132055913.en [Accessed 28 May 2022]
BirdLife International (2021) Acrocephalus rimitarae. The IUCN Red List of Threatened Species 2021: e.T22714826A171783171. Available at https://dx.doi.org/10.2305/IUCN.UK.2021-3.RLTS.T22714826A171783171.en. [Accessed 28 May 2022]
Blumstein DT (2002) Moving to suburbia: ontogenetic and evolutionary consequences of life on predator-free islands. Journal of Biogeography 29, 685-692.
| Crossref | Google Scholar |
Bonnaud E, Bourgeois K, Vidal E, Kayser Y, Tranchant Y, Legrand J (2007) Feeding ecology of a feral cat population on a small Mediterranean island. Journal of Mammalogy 88(4), 1074-1081.
| Crossref | Google Scholar |
Bonnaud E, Medina FM, Vidal E, Nogales M, Tershy B, Zavaleta E, Donlan CJ, Keitt B, Le Corre M, Horwath SV (2011) The diet of feral cats on islands: a review and a call for more studies. Biological Invasions 13(3), 581-603.
| Crossref | Google Scholar |
Bonnaud E, Palmas P, Bourgeois K, Ollier S, Zarzoso-Lacoste D, Vidal E (2015) Island specificities matter: cat diet differs significantly between islands of a major breeding archipelago for a vulnerable endemic seabird. Biological Invasions 17(10), 2927-2941.
| Crossref | Google Scholar |
Cliff HB, Jones ME, Johnson CN, Pech RP, Biemans BT, Barmuta LA, Norbury GL (2022) Rapid gain and loss of predator recognition by an evolutionarily naïve lizard. Austral Ecology 47, 641-652.
| Crossref | Google Scholar |
Courchamp F, Langlais M, Sugihara G (1999) Control of rabbits to protect island birds from cat predation. Biological Conservation 89, 219-225.
| Crossref | Google Scholar |
Courchamp F, Langlais M, Sugihara G (2000) Rabbits killing birds: modelling the hyperpredation process. Journal of Animal Ecology 69, 154-164.
| Crossref | Google Scholar |
Department of Conservation, New Zealand Government (2023) Feral cats. Available at https://www.doc.govt.nz/nature/pests-and-threats/animal-pests/feral-cats/
Doherty TS, Glen AS, Nimmo DG, Ritchie EG, Dickman CR (2016) Invasive predators and global biodiversity loss. Proceedings of the National Academy of Sciences 113, 11261-11265.
| Crossref | Google Scholar |
Edwards GP, De Preu N, Shakeshaft BJ, Crealy IV, Paltridge RM (2001) Home range and movements of male feral cats (Felis catus) in a semiarid woodland environment in central Australia. Austral Ecology 26(1), 93-101.
| Crossref | Google Scholar |
Efford M (2015) secr: Spatially explicit capture–recapture models. R package version 4.3.1. Available at https://CRAN.R-project.org/package=secr
Engeman RM (2005) Indexing principles and a widely applicable paradigm for indexing animal populations. Wildlife Research 32(3), 203-210.
| Crossref | Google Scholar |
Fawcett T (2006) An introduction to ROC analysis. Pattern Recognition Letters 27(8), 861-874.
| Crossref | Google Scholar |
Fox J, Weisberg S (2019) ‘An R companion to applied regression.’ 3rd edn. (Sage: Thousand Oaks, CA, USA). Available at https://socialsciences.mcmaster.ca/jfox/Books/Companion/
Harper GA, Bunbury N (2015) Invasive rats on tropical islands: their population biology and impacts on native species. Global Ecology and Conservation 3, 607-627.
| Crossref | Google Scholar |
Harper GA, Dickinson KJM, Seddon PJ (2005) Habitat use by three rat species (Rattusspp.) on Stewart Island/Rakiura, New Zealand. New Zealand Journal of Ecology 29, 251-260.
| Google Scholar |
Harper GA, van Dinther M, Russell JC, Bunbury N (2015) The response of black rats (Rattus rattus) to evergreen and seasonally arid habitats: informing eradication planning on a tropical island. Biological Conservation 185, 66-74.
| Crossref | Google Scholar |
Harrison S, Noss R (2017) Endemic hotspots are linked to stable climate refugia. Annals of Botany 119, 207-214.
| Crossref | Google Scholar |
Hu Y, Hu S, Wang W, Wu X, Marshall FB, Chen X, Hou L (2014) Earliest evidence for commensal processes of cat domestication. Proceedings of the National Academy of Sciences 111, 116-120.
| Crossref | Google Scholar |
King CM, Foster S, Miller S (2011) Invasive European rats in Britain and New Zealand: same species, different outcomes. Journal of Zoology 285, 172-179.
| Crossref | Google Scholar |
Lamelas-López L, Santos MJ (2021) Factors influencing the relative abundance of invasive predators and omnivores on islands. Biological Invasions 23(9), 2819-2830.
| Crossref | Google Scholar |
Lavery TH, Alabai M, Holland P, Qaqara C, Vatohi N (2020) Feral cat abundance, density and activity in tropical island rainforests. Wildlife Research 47(8), 660-668.
| Crossref | Google Scholar |
Lazenby BT, Mooney NJ, Dickman CR (2015) Effects of low-level culling of feral cats in open populations: a case study from the forests of southern Tasmania. Wildlife Research 41, 407-420.
| Crossref | Google Scholar |
Legge S, Murphy BP, McGregor H, Woinarski JCZ, Augusteyn J, Ballard G, Baseler M, Buck-Master T, Dickman CR, Doherty T, Edwards G, Eyre T, Fancourt BA, Ferguson D, Forsyth DM, Geary WL, Gentle M, Gillespie G, Greenwood L, Hohnen R, Hume S, Johnson CN, Maxwell M, McDonald PJ, Morris K, Moseby K, Newsome T, Nimmo D, Paltridge R, Ramsey D, Read J, Rendall A, Rich M, Ritchie E, Rowland J, Short J, Stokeld D, Sutherland DR, Wayne AF, Woodford L, Zewe F (2017) Enumerating a continental-scale threat: how many feral cats are in Australia? Biological Conservation 206, 293-303.
| Crossref | Google Scholar |
Marples RR (1955) Rattus exulans in Western Samoa. Pacific Science 9, 171-176.
| Google Scholar |
Matisoo-Smith E, Roberts RM, Irwin GJ, Allen JS, Penny D, Lambert DM (1999) Patterns of prehistoric human mobility in Polynesia indicated by mtDNA from the Pacific Rat. Proceedings of the National Academy of Sciences 95(25), 15 145-15 150.
| Crossref | Google Scholar |
McCartney WC (1970) Arboreal behavior of the Polynesian rat (Rattus exulans). BioScience 20, 1061-1062.
| Crossref | Google Scholar |
McGregor HW, Legge S, Potts J, Jones ME, Johnson CN (2015) Density and home range of feral cats in north-western Australia. Wildlife Research 42, 223-231.
| Crossref | Google Scholar |
Medina FM, Bonnaud E, Vidal E, Tershy BR, Zavaleta ES, Josh Donlan C, Keitt BS, Le Corre M, Horwath SV, Nogales M (2011) A global review of the impacts of invasive cats on island endangered vertebrates. Global Change Biology 17, 3503-3510.
| Crossref | Google Scholar |
Meek PD, Ballard G, Claridge A, Kays R, Moseby K, O’brien T, O’Connell A, Sanderson J, Swann DE, Tobler M, Townsend S (2014) Recommended guiding principles for reporting on camera trapping research. Biodiversity and Conservation 23(9), 2321-2343.
| Crossref | Google Scholar |
Meyer J-Y, Strasberg D, Vidal E, Jourdan H, Delnatte C, Muller S (2018) Quelle stratégie de recherche pour une meilleure conservation de la biodiversité terrestre dans les îles tropicales ultramarines françaises? Naturae 2, 15-26.
| Google Scholar |
Meyer J-Y, Palmas P (in press) Monographie géographique de Polynésie Française. In ‘Atlas des Mammifères Sauvages de France. Vol. 3. Carnivores et Primates’. (Eds A Savouré-Soubelet, S Aulagnier, P Haffner, A Maille, F Moutou, C Richard-Hansen, S Ruette, G Veron). (Publications du Muséum National d’Histoire Naturelle, Collection Patrimoines Naturels: Paris, France)
Monnet C, Thibault J-C, Varney A (1993) Stability and changes during the twentieth century in the breeding landbirds of Tahiti (Polynesia). Bird Conservation International 3, 261-280.
| Crossref | Google Scholar |
Myers N, Mittermeier RA, Mittermeier CG, Fonseca GAB, Kent J (2000) Biodiversity hotspots for conservation priorities. Nature 403, 853-858.
| Crossref | Google Scholar |
Nichols M, Glen AS, Garvey P, Ross J (2017) A comparison of horizontal versus vertical camera placement to detect feral cats and mustelids. New Zealand Journal of Ecology 41, 145-150.
| Crossref | Google Scholar |
Nicholson AJ, Warner DW (1953) The rodents of New Caledonia. Journal of Mammalogy 34, 168-179.
| Crossref | Google Scholar |
Nijsse R, Mughini-Gras L, Wagenaar JA, Ploeger HW (2014) Coprophagy in dogs interferes in the diagnosis of parasitic infections by faecal examination. Veterinary Parasitology 204(3–4), 304-309.
| Crossref | Google Scholar |
Nogales M, Vidal E, Medina FM, Bonnaud E, Tershy BR, Campbell KJ, Zavaleta ES (2013) Feral cats and biodiversity conservation: the urgent prioritization of island management. BioScience 63(10), 804-810.
| Crossref | Google Scholar |
Palmas P, Jourdan H, Rigault F, Debar L, De Meringo H, Bourguet E, Mathivet M, Lee M, Adjouhgniope R, Papillon Y, Bonnaud E, Vidal E (2017) Feral cats threaten the outstanding endemic fauna of the New Caledonia biodiversity hotspot. Biological Conservation 214, 250-259.
| Crossref | Google Scholar |
Palmas P, Gouyet R, Oedin M, Millon A, Cassan J-J, Kowi J, Bonnaud E, Vidal E (2020a) Rapid recolonisation of feral cats following intensive culling in a semi-isolated context. NeoBiota 63, 177-200.
| Crossref | Google Scholar |
Palmas P, Jourdan H, Debar L, Bourguet E, Rigault F, Bonnaud E, Vidal E (2020b) A conservation paradox: Endangered and iconic flightless kagu (Rhynochetos jubatus) apparently escape feral cat predation. New Zealand Journal of Ecology 44(1), 1-8.
| Crossref | Google Scholar |
Province Nord (2018) Code de l’environnement de la Province Nord. Available at https://dimenc.gouv.nc/sites/default/files/documents/4-1-CodeEnv_PN_ICPE_fev2018_ExtraitLivresI%26IV.pdf
Rackham JD (1979) Rattus rattus: the introduction of the black rat into Britain. Antiquity 53, 112-120.
| Crossref | Google Scholar |
Recio MR, Seddon PJ, Moore AB (2015) Niche and movement models identify corridors of introduced feral cats infringing ecologically sensitive areas in New Zealand. Biological Conservation 192, 48-56.
| Crossref | Google Scholar |
Ringler D, Russell JC, Le Corre M (2015) Trophic roles of black rats and seabird impacts on tropical islands: mesopredator release or hyperpredation? Biological Conservation 185, 75-84.
| Crossref | Google Scholar |
Roberts M (1991) Origin, dispersal routes, and geographic distribution of Rattus exulans, with special reference to New Zealand. Pacific Science 45, 123-130.
| Google Scholar |
Russell JC, Clout MN (2004) Modelling the distribution and interaction of introduced rodents on New Zealand offshore islands. Global Ecology and Biogeography 13, 497-507.
| Crossref | Google Scholar |
Russell JC, Le Corre M (2009) Introduced mammal impacts on seabirds in the Îles Éparses, Western Indian Ocean. Marine Ornithology 37, 121-129.
| Google Scholar |
Russell JC, Towns DR, Anderson SH, Clout MN (2005) Intercepting the first rat ashore. Nature 437, 1107.
| Crossref | Google Scholar |
Russell JC, Lecomte V, Dumont Y, Le Corre M (2009) Intraguild predation and mesopredator release effect on long-lived prey. Ecological Modelling 220, 1098-1104.
| Crossref | Google Scholar |
Seitre R, Seitre J (1992) Causes of land-bird extinctions in French Polynesia. Oryx 26(4), 215-222.
| Crossref | Google Scholar |
Shiels AB, Flores CA, Khamsing A, Krushelnycky PD, Mosher SM, Drake DR (2013) Dietary niche differentiation among three species of invasive rodents (Rattus rattus, R. exulans, Mus musculus). Biological Invasions 15(5), 1037-1048.
| Crossref | Google Scholar |
Shiels AB, Pitt WC, Sugihara RT, Witmer GW (2014) Biology and impacts of Pacific island invasive species. 11. Rattus rattus, the black rat (Rodentia: Muridae). Pacific Science 68, 145-184.
| Crossref | Google Scholar |
Signorell A, Aho K, Alfons A et al. (2021) DescTools: tools for descriptive statistics. R package version 0.99.44. Available at https://andrisignorell.github.io/DescTools/, https://github.com/AndriSignorell/DescTools/
Smith AP, Quin DG (1996) Patterns and causes of extinction and decline in Australian conilurine rodents. Biological Conservation 77, 243-267.
| Crossref | Google Scholar |
Sparkes J, Fleming PJS, McSorley A, Mitchell B (2021) How many feral cats can be individually identified from camera trap images? Population monitoring, ecological utility and camera trap settings. Ecological Management and Restoration 22(3), 246-255.
| Crossref | Google Scholar |
Spatz DR, Zilliacus KM, Holmes ND, Butchart SHM, Genovesi P, Ceballos G, Tershy BR, Croll DA (2017) Globally threatened vertebrates on islands with invasive species. Science Advances 3(10), e1603080.
| Crossref | Google Scholar |
Stokeld D, Frank ASK, Hill B, Choy JL, Mahney T, Stevens A, Young S, Rangers D, Rangers W, Gillespie GR (2015) Multiple cameras required to reliably detect feral cats in northern Australian tropical savanna: an evaluation of sampling design when using camera traps. Wildlife Research 42(8), 642-649.
| Crossref | Google Scholar |
Sugihara RT (1997) Abundance and diets of rats in two Hawaiian forests. Pacific Science 51, 189-198.
| Google Scholar |
Thibault J-C, Meyer J-Y (2001) Contemporary extinction and population declines of the monarchs (Pomarea spp.) in French Polynesia, South Pacific Ocean. Oryx 35(1), 73-80.
| Crossref | Google Scholar |
TIB (2022) Threatened Island Biodiversity Database – Island Conservation. Available at http://tib.islandconservation.org
Twibell J (1973) The ecology of rodents in the Tonga Islands. Pacific Science 27, 92-98.
| Google Scholar |
van Der Ende M, Strijkstra AM, Dias E, Smit C (2017) Spatial ecology and prey choice of tagged feral cats on the island of Schiermonnikoog. Lutra 60(2), 73-91.
| Google Scholar |
Veitch CR, Miskelly CM, Harper GA, Taylor GA, Tennyson AJD (2004) Birds of the Kermadec Islands, south-west Pacific. Notornis 51, 61-90.
| Google Scholar |
Walker JK, Bruce SJ, Dale AR (2017) A survey of public opinion on cat (Felis catus) predation and the future direction of cat management in New Zealand. Animals 7(7), 49.
| Crossref | Google Scholar |
Wang SW, Macdonald DW (2009) The use of camera traps for estimating tiger and leopard populations in the high altitude mountains of Bhutan. Biological Conservation 142(3), 606-613.
| Crossref | Google Scholar |
Wilcox RC, Spotswood E (2011) Introduced predators and seabird predation on Mo’orea, French Polynesia. Notornis 58, 39-42.
| Google Scholar |
Wilmshurst JM, Hunt TL, Lipo CP, Anderson AJ (2011) High-precision radiocarbon dating shows recent and rapid initial human colonization of East Polynesia. Proceedings of the National Academy of Sciences of the United States of America 108, 1815-1820.
| Crossref | Google Scholar |
Yom-Tov Y, Yom-Tov S, Moller H (1999) Competition, coexistence, and adaptation amongst rodent invaders to Pacific and New Zealand islands. Journal of Biogeography 26, 947-958.
| Crossref | Google Scholar |
Zarzoso-Lacoste D, Bonnaud E, Corse E, Gilles A, Meglecz E, Costedoat C, Gouni A, Vidal E (2016) Improving morphological diet studies with molecular ecology: an application for invasive mammal predation on island birds. Biological Conservation 193, 134-142.
| Crossref | Google Scholar |
Zarzoso-Lacoste D, Bonnaud E, Corse E, Dubut V, Lorvelec O, De Meringo H, Santelli C, Meunier J-Y, Ghestemme T, Gouni A, Vidal E (2019) Stuck amongst introduced species: Trophic ecology reveals complex relationships between the critically endangered Niau kingfisher and introduced predators, competitors and prey. NeoBiota 53, 61-82.
| Crossref | Google Scholar |
Zhang J, Fan M, Kuang Y (2006) Rabbits killing birds revisited. Mathematical Biosciences 203, 100-123.
| Crossref | Google Scholar |
Ziadinov I, Mathis A, Trachsel D, Rysmukhambetova A, Abdyjaparov TA, Kuttubaev OT, Deplazes P, Torgerson PR (2008) Canine echinococcosis in Kyrgyzstan: using prevalence data adjusted for measurement error to develop transmission dynamics models. International Journal for Parasitology 38(10), 1179-1190.
| Crossref | Google Scholar |